No Temperature Display on Garmin 4208 - GSD 22 - Transom Transduc

Hello all, I am not receiving a temp reading on my Garmin 4208 which is connected to a GSD 22 sonar and transom mount transducer. It appears the speed and sonar operation is working ok but no temperature reading. Any thoughts on where to look to fix the problem? Thank you.

I would recommend having the back part of the transducer a little higher (toward the sky) than the nose of the transducer. When I say a little, I mean a very slightly. This way the nose of the transducer pushes the water and any bubbles away from the face.

I suspect that the long run will not affect the performance, and I suspect that extensions are available, check with Lowrance.
Consider a through hull mount, if you are worried about prop wash interferenace... Also, I would like the depth to be read closer to mid ship..... Hate to pull be vessel. but that is how you would do it...

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Hi
I realize this question is old, but for the benefit of someone else who might have the same query, the NMEA 0183 outputs from the 4208 are the gray (+) and black (-) which go to the data in of your DSC VHF. The data OUT from your VHF connect to the white (+) and black (-) of the 4208.

If using NMEA 2000, using the second link below, start on page 10.

The installation instructions are about halfway down on the link page and can be accessed directly from the install link below if you prefer. -Steve

It's probably the ccfl is burned out. The illuminator is a very interesting (and very thin) little contraption. Inside the illuminator is an L-shaped ccfl (cold cathode fluresent lamp.) They run at very high voltages. Eventually the ccfl burns out.Go to www.ccflwarehouse.com. They can fix you up with a mail-in replacement for around $35.You can read about my experience at www.catalina22experiment.comBest,Zig

It all depends on the type of boat and how you are going to be using the fishfinder. Here is my email: kevin@sun-me.net if you want to discuss your uses further and if you want to purchase a transducer.

i will exchange this for you, free shipping no charge, just ship it to me to inspect and i will send you the transom ducer no charge, if you have a bronze thru hull with speed and temp to trade for a plastic transom mount with speed and temp, let me know

I think you need to level the transducer. You have it pointed way out in front of you so that when you're going fast it is able to bounce the signal off the bottom and it comes back to where the boat has traveled to. When you're going slow you're bouncing it out in front of you but it comes back up in front of you. Sorry but I can't find a picture of a Garmin transducer. Hope this helps.

Interference like that is usually caused by electrical noise. Does it happen when everything else on the boat is turned off? If the answer is no, then you can isolate the source of the interference by turning things on one at time. Follow your transducer cable and make sure it has not been damaged or altered in any way.

Also make sure that your gain is set to auto

The GSD 21 has an LED indicator light on it. If it detects a malfunction the LED will flash in distinct colors or patterns. In the troubleshooting section of the owners manual there is a list that explains what each flash pattern means.